I like the McCoy MC-8 in a standard head Nova, but in hotter summer times I change to the OD 99 plug. It's a bit thicker wire and holds up to the hotter engine around 250-260.

Turbo plugs/ I like the OD 97t the best, but the 87t is a nice plug for winter.....

In the summer I replace plugs more often than in winter or fall....